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y=500an
x+y=18 dikali 200
200x+500y=5400
pake eliminasi
200x + 200y = 3600
200x + 500y = 5400
---------------------------- (-)
-300y = -1800
y = 6
x+y=18
x+6=18
x= 12
uang 200an = 12
uang 500an = 6